Plug-in heater



FIG. 1 is a front-side perspective view of a plug-in heater;

FIG. 2 is a front view of the plug-in heater of FIG. 1 ;

FIG. 3 is a top view of the plug-in heater of FIG. 1 ;

FIG. 4 is a left side view of the plug-in heater of FIG. 1 ;

FIG. 5 is a bottom view of the plug-in heater of FIG. 1 ;

FIG. 6 is a right side view of the plug-in heater of FIG. 1 ;

FIG. 7 is a rear view of the plug-in heater of FIG. 1 ; and,

FIG. 8 is a rear-side perspective view of the plug-in heater of FIG. 1 .

The broken lines in the drawings illustrate portions of the plug-in heater that form no part of the claimed design. 

CLAIM I claim the ornamental design for a plug-in heater, as shown and described. 